Missing `us-gov-east-1` region for FIPS endpoint

Lookin at the function which [detects FIPS GovCLoud endpoints](https://github.com/minio/minio-go/blob/master/pkg/s3utils/utils.go#L194), it appears that the `s3-fips.us-gov-east-1.amazonaws.com` endpoint is not included. 

<img width="996" alt="Screenshot 2023-08-23 at 8 11 26 AM" src="https://github.com/minio/minio-go/assets/86423878/35598ce9-ac90-4b74-a6c8-5090a51e1a03">
